[refactor]: remove Value enum

[mversic]

Description

• break dependency of Metadata::Value and Query::Output on Value
• remove Value enum. It's useless after removal of expressions

Linked issue

Closes #{issue_number}

Benefits

Checklist

• I've read CONTRIBUTING.md
• I've used the standard signed-off commit format (or will squash just before merging)
• All applicable CI checks pass (or I promised to make them pass later)
• (optional) I've written unit tests for the code changes
• I replied to all comments after code review, marking all implemented changes with thumbs up